What's your favorite Doctor Who Monster?

So what's your favorite Doctor Who monster that isn't a Dalek? And while you're at it, what is one of the monsters that you hate because you think it's so stupid? My favorite Monster is probably the Judoon, and one of them that I hate (forgive me here, because I know that this one is actually rather popular) are the cybermen.

oh, yes. Even though the first episode with the slitheens was the first episode I really watched of Doctor Who, I hate those aliens. I skipped the episode where they showed up again because of how much I hate them.